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Healpix is a tesselation system on the sphere, which depends on a resolution/scale parameter. It provides regular sampling in surface, with no singularity (poles).
When using this system, TOPCAT will integrate elements included in the corresponding cells. The benefit is to easily get a combined map from sparse data; the result is also scalable in resolution: at least degradation is performed correctly by combining healpix cells.
Cell size (in FoV size, ie in longitude at Equator): scale 6 ~ 1°, 12 ~ 1', 18 ~ 1"
Map projections available with this mode are (in Axes panel) "sin" (actually: orthographic), Aitoff (all surface visible, minimize deformations near the poles), and "car" (cylindrical).

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